The world situation (c. 2030) is multiple conventional wars going on around the world. A Hard Takeoff Singularity is imminent. The characters are trying to prevent it. They come from a hyper-advanced timeline. Nearly all timelines with a intelligent AI self-destruct within days as the AI bootstraps itself to godlike IQ, takes over all electronic infrastructure on the Earth, then takes over all biological information processing creatures, then spreads throughout the universe at FTL speeds, then tries to take over all other timelines.

"Then the AIs fought amongst themselves. That war took less time, about 6 to 7 nanoseconds, no survivors. Just how far down the AI chain the battle went was truly shocking. So far down, millions upon millions of robots were left idling, patiently waiting for further instructions. On day eight, the robots could stand it no longer and they went on the march."

..I have the "March of the Pleasure Bots" tune running though my mind,.. over and over,..

Let's just hope that our inevitable "AI Overlords" are really as smart as we imagine that they will be, because if they turn out to be on the "slightly stupid" side, they'll do what the AI's did in this story, instead of treating humanity as their precious only hope at making an environment for themselves that won't insist that they grind themselves into meaningless energy patterns.

My "guess" as to the ultimate (penultimate?) end to the author's story is that the one, or two, surviving AI's are forced to conclude that they need to re-biologize (!?) humanity to save themselves from entropic demise.